Sofa



FIG. 1 is a front elevational view of a sofa showing my new design;

FIG. 2 is a top, front and side perspective view thereof;

FIG. 3 is a top and front perspective view thereof;

FIG. 4 is an end elevational view thereof, the end view that shown in FIG. 4 being the mirror image thereof; and,

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a sofa, as shown and described. 